Coating of webs in web feeding machines



March 19, 1957 G. R. ROBERTS ETAL 2,735,652

COATING 0F WEBS m wEB FEEDING MACHINES Filed July 6, 1954 s Sheets-Sheet 1 fwa wad/14w: 3 34 417 a," FZ/ZM March e. R. ROBERTS EIAL 2,785,652

COATING 0F WEBS IN WEB FEEDING MACHINES Filed July 6, 1954 3 Sheets-Sheet 2 March 19, 1957 G. R. ROBERTS EIAL 2,785,652

COATING OF WEBS IN WEB FEEDING MACHINES Filed July 6, 1e54 s Shets-Sheet s 1 75m fwl lqATTORNEY release of the holding means.

2,785,652 Patented Mar. '19, 1957 COATING F WEBS 1N WEB FEEDING MACHINES George Richard Roberts, New Barn, Longfield, and

Ronald Thomas Heathcote, Dartford, England, assignors to Bowaters Development and Research Limited, London, England, a company of Great Britain Application July 6, 1954, Serial No. 441,496

Claims priority, application Great Britain July 14, 1953 3 Claims. (Cl. 118-247) This invention relates to a device for use in web feeding machines wherein the web is normally in contact with a coating roll and which comprises means for lifting the web clear of the coating roll when desired.

It has been proposed to construct a winder for paper tubes in which at the beginning of the winding the end of the paper web is carried over and clear of a glue roll by a movable table. As soon as the paper has been gripped in the winding mandrel the table is withdrawn, the paper web remaining in contact with it throughout the winding of the tube.

The object of the invention is to provide a simple and improved construction of shielding means which may be used in combination with a web coating roll to lift the web clear of the roll when desired, and which may also be used in conjunction with a pressure bar to press the web on to the coating roll.

According to the invention, in a web feeding machine comprising a roll disposed so that the web in the normal course of its travel will be in surface contact with the roll so as to be coated with a substance (e. g. an adhesive) carried by the roll, there is provided, in combination with the roll, a shielding device normally out of contact with the web and means for interposing the device, to interrupt the coating process, between the roll and the web so that the device will then support the web clear of the roll whilst the web continues to travel.

In an embodiment of the invention the shielding device comprises components normally separated but which may be brought together to form a combined support for the web, each component being pivoted about the axis of the roll so as to be capable of being swung to and from the interposed position. A pressure bar is also provided to press the web against the roll during the coating process. This pressure bar is withdrawable and pivoted so that it may be swung to and from its withdrawn position, and holding means are provided to anchor it automatically in the withdrawn position pending the The pressure bar is also linked to the components of the shielding device so that they move to the interposed position when the pressure bar is withdrawn.

An embodiment of the invention as applied to a convolute drum winder will now be described with reference to the accompanying drawings in which:

Figure 1 is a diagrammatic side elevation of the device in the interposed position,

Figure 2 is a fragmentary detail of some of the parts shown in Figure 1 and disclosing apparatus for moving the shielding device into the interposed position,

Figure 3 is a detail side elevation of the device in the withdrawn position,

Figure 4 is a fragmentary, perspective View, partly in section, of the shielding device in the interposed position, and

Figure 5 is a fragmentary perspective view of the shielding device in the withdrawn position.

Referring now to the drawings a shielding device consists of two component guide plates 1 and 2 which are pivoted about the axis 3' of a coating roll 3. Running in contact with coating roll 3 is a furnishing roll 4 which runs in a glue tank 5. A web of paper w runs from an unwinding reel (not shown) to a drum winding mandrel 6. Fixed top guide plates are indicated at 7 and 8 and fixed lower guide plates at 9 and 10.

A pressure bar 11 is carried by a pair of arms one of which is shown at 12. These arms are pivoted about an axis at 13. The arm 12 is formed with a semi-circular portion 14, having a notch 15 for engagement by a pivoted catch 16. This catch may be lifted by a solenoid 17. Mounted on the arm 12 is a roller 18 and its end 19 is spring loaded by a tension spring 20. The guide plates 1 and 2 are connected to the arm 12 by links 21, 22, pivoted at their ends. Two rotary guillotine drums 23 and 24 are provided to cut the web with knives 25, 26 and the top drum 23 carries a cam plate 27. These drums and their actuating means may be arranged as described in the co-pending application of George Richard Roberts, Ronald Thomas Heathcote, and Ernest James Lister, Serial No. 441,497, filed July 6, 1954. Other details of a convolute winder in conjunction with which the present invention may be used are described in the co-pending applications of George Richard Roberts and Ronald Thomas Heathcote, Serial No. 441,494, filed July 6, 1954 (now abandoned); George Richard Roberts and Ronald Thomas Heathcote, Serial No. 441,495, filed July 6, 1954; and George Richard Roberts and Ernest James Lister, Serial No. 441,452, filed July 6, 1954.

In operation, assuming that the web w is in its normal course of travel and in contact with the coating roll 3 as shown in Figure 3, when suflicient material has been wound on the mandrel 6, the drums 23 and 24 are caused to be rotated so that the web is cut by the knives 25, 26. Further rotation of the drums brings the cam plate 27 into engagement with the roller 18, thus causing the arms 12 and the pressure bar 11 to be lifted from the position shown in Figure 3 to that shown in Figure 2, the catch 16 engaging the notch 15. In this position the guide plates 1 and 2 have been raised by the links 21, 22 to the positions shown in Figures 1 and 4 to shield the web from the coating roll 3. When the web has been cut and that portion of the web in front of the out has been wound on the mandrel to complete the tube, the mandrel is stopped and the tube removed. During this operation the web behind the cut is fed forward by continued rotation of the drums 23 and 24, under the fixed guide plates 7 and 8 over the guide plates 1, 2, 9 and 10. The drums stop and the leading portion of the web is gripped on the mandrel which then starts to revolve, the guide plates 1 and 2 being held in their operative position until one lap of the web has been wound around the mandrel 6. This ensures that no glue will appear on the inside surface of the wound tu'be.

When the first lap has been completed the solenoid 17 is energised to lift the catch 16 from the notch 15 allowing the spring 20 to pull the pressure bar into the position shown in Figure 3. As the pressure bar descends to press the web on the coating roll 3 the guide plates 1 and 2 are swung about the axis of the coating roll and lowered to the position shown in Figures 3 and 5, so that the underside of the web may be coated with glue. When suificient laps have been wound on the mandrel the drums 23, 24 are again rotated and the cycle is repeated.

What is claimed is:

1. In a web-feeding machine including a roll disposed so that said web in the normal course of its travel will be in surface contact with said roll so as to be coated with a substance carried by said roll, the combination with said said web clear of-said roll whilst said web continues to travel, a withdrawable pressure bar to press said web against said roll during the coating process, and linkage connecting said shielding device to said pressure bar so that when said pressurebar is withdrawn said device moves to said interposed position.

a 2. The combination according to claim 1 in which said pressure bar is pivoted so as to be capable of being swung to and fromVi-ts withdrawn position.

3. The combination according to claim 1 including 10 a 4 a holding means to anchor said pressure bar automatically when it reaches its withdrawn position and thereby to hold said shielding device in said interposed position pending release of said holding means.

References Cited' in the file of this patent UNITED STATES PATENTS 

